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arXiv 2007.01843math.AP
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双曲型Keller-Segel方程中的锐间断行波

Sharp discontinuous traveling waves in a hyperbolic Keller--Segel equation

Xiaoming Fu, Quentin Griette, Pierre Magal

摘要:

在这项工作中,我们描述了一个双曲模型的细胞与细胞排斥与动态的细胞群体。更确切地说,我们考虑一群细胞产生一个场(我们称之为“压力”),它诱导细胞沿着与梯度相反的方向运动。该字段指示局部人口密度,我们假设细胞会尝试避开拥挤的区域,并更喜欢远离承载能力的局部空置空间。我们分析了相应的Cauchy问题在实直线上的适定性。我们从有界的初始条件出发,考虑了初始条件的一些不变性质,如连续性、光滑性和单调性。我们还详细描述了传播边界附近的水平集的解的行为,我们发现,一个渐近跳跃形成的解决方案的一个自然类的初始条件。最后,我们证明了该模型的尖行波的存在性,它是以恒定速度传播的特解,并认为尖行波必然是不连续的。这一分析得到了PDE问题的数值模拟的证实。

英文摘要:

In this work we describe a hyperbolic model with cell-cell repulsion with a dynamics in the population of cells. More precisely, we consider a population of cells producing a field (which we call "pressure") which induces a motion of the cells following the opposite of the gradient. The field indicates the local density of population and we assume that cells try to avoid crowded areas and prefer locally empty spaces which are far away from the carrying capacity. We analyze the well-posedness property of the associated Cauchy problem on the real line. We start from bounded initial conditions and we consider some invariant properties of the initial conditions such as the continuity, smoothness and monotonicity. We also describe in detail the behavior of the level sets near the propagating boundary of the solution and we find that an asymptotic jump is formed on the solution for a natural class of initial conditions. Finally, we prove the existence of sharp traveling waves for this model, which are particular solutions traveling at a constant speed, and argue that sharp traveling waves are necessarily discontinuous. This analysis is confirmed by numerical simulations of the PDE problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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